package day01;

public class juli {
	public static void main(String[] args) {
		double x1=Integer.parseInt(args[0]);
		double y1=Integer.parseInt(args[1]);
		double x2=Integer.parseInt(args[2]);
		double y2=Integer.parseInt(args[3]);
		double distance=Math.sqrt(Math.pow(x2-x1, 2)+Math.pow(y2-y1, 2));
		System.out.println("distance="+distance);
	}

}
